The Threefold Tie by Aster Glenn Gray

Everything was fine till Jack fell in love with his former lover’s wife.

Shy Civil War veteran Jack never expected to be involved in an affair du coeur. It seemed like a minor miracle when he and his comrade-in-arms Everett became lovers – and a painful return to reality when Everett married his sweetheart, Sophie. And the situation is only more complicated now that Jack has fallen in love with Sophie, too.

When Everett found himself in love with Sophie, the proper thing for him to do was to end his dalliance with Jack and marry her. But even though everyone says it’s impossible to be in love with two people at once, Everett has never really gotten over Jack.
Sophie’s unconventional family has shown her that love is not always simple. But she’s still startled to find herself responding to Jack’s very obvious crush – and to realize that Everett, too, still has feelings for Jack. How can they navigate nineteenth century romantic conventions and still find a satisfying arrangement?